- 1. Komplet - The Wood. Consequences of Pollution, 20 mikro. preparatov Lieder_4510
- 2. Damaged lichen, caused by air pollution Lieder_4520d
- 3. Komplet - The Water Pollution. Problems and Results, 20 mikro. preparatov Lieder_4540
- 4. Komplet - Air Pollution and Allergens, 15 mikro. preparatov Lieder_4590
- 5. MULTIMEDIA-PACKAGE. Air Pollution and Allergens, Basic Set of 6 slides and teaching material, Lieder_SMD-44
- 6. Air Pollution and Allergens, Basic Set of 6 slides, Student Set Lieder_SSD-44
- 7. Our Waters, Problems of Pollution, Methods of Protection and Recycling. Water courses in cultivated Lieder_8233
- 8. CD133. Our Waters, Pollution, Protection and Recycling. In these days, it is scarcely possible Lieder_CD133
- 9. Our Waters, Problems of Pollution, Methods of Protection and recycling (former no. 862) Complete Lieder_1800
- 10. Water pollution by the seepage sewage effluent, 17 projection slides Lieder_1807
- 11. Results of water pollution: eutrophication and destruction of water organisms, 9 projection slides Lieder_1809
- 12. Water Pollution, 20 microscope slides Lieder_GR-H2
- 13. Air Pollution and Allergens, 15 microscope slides Lieder_GR-H4